Which statement best describes the maintenance requirement for B28 systems using A3 refrigerants?

• A. Maintenance is optional.
• B. Ongoing maintenance and trained personnel are required.
• C. Maintenance only during initial installation.
• D. Maintenance is prohibited for safety reasons.

Answer: (B)

High flammability of A3 refrigerants means the system can become dangerous if a leak occurs. Because of that risk, the system must be continually supervised by trained personnel who know how to perform regular leak checks, verify that safety devices and interlocks are functioning, ensure proper ventilation, and calibrate gas detectors. They also handle safe servicing procedures, maintain records, and address any component degradation before it becomes a hazard. Maintenance isn’t optional, nor is it limited to installation, and it isn’t prohibited—the ongoing, qualified oversight is what keeps B28 systems safe in real-world operation.